Abrasive wheel

ABSTRACT

A rotary abrasive device having a plurality of independent depending leaves mounted internally of a rotary hub structure for abrading or polishing purposes.

0 United States Patent 1 3,579,925

[72] Inventor William P. Densmore 2,035,042 3/1936 Bridgman 51/337 Worcester, Mass. 2,635,393 4/1953 Barth 51/73 [21] Appl. No. 780,404 2,973,539 3/1961 Buehr1e..... 15/179 [22] Filed Dec. 2,1968 3,188,674 6/1965 Hobbs 15/179 [45] Patented May 25, 1971 3,382,057 5/1968 Hohenberger..... 51/337 [73] Assignee Norton Company 3,455,068 7/1969 Belanger 51/337 Troy, N.Y. 2,204,516 6/1940 Stone 15/104.04(X) FOREIGN PATENTS [54} ABRASWE WHEEL 1,031,561 6/ 1966 Great Britain l5/104.04

1 Claim, 2 Drawing Figs. Primary ExaminerOthell M. Simpson 52 us. C1 Smith [51] Int. Cl. B24d 9/00 [50] Field of Search [56] References Cited ABSTRACT: A rotary abrasive device having a plurality of in- UNITED STATES PATENTS 1,192,984 8/1916 Bruff dependent depending leaves mounted internally of a rotary hub structure for abrading or polishing purposes.

PATENTEU M25 l97l Inventor William P. Densmore by M 5 His Afforney.

1 ABRASIVE WHEEL FIELD OF lNVENTlON The present invention relates to a device for use in cleaning, polishing or abrading the external surface of a relatively uniform workpiece such as a cylindrical pin, tube or the like.

PRIOR ART So-called centerless grinders are commonly used for abrading or polishing the external surfaces of generally cylindrical SUMMARY The present invention not only provides a simple and effective means for operating abrasively on the external surface of a tubular or cylindrical workpiece, but it incorporates the desirable intermittent action of a flap wheel in such operation by a unique construction. A rotary hub or wheel is provided with a positioning and drive means at one end thereof and a laterally extending rim portion. Dependent from the interior surface of such rim portion is a plurality of independently adhered abrasive strips or flaps. Since these are preferably quite flexible, they do not actually extend radially inward towards the center of the hub in all instances but are so positioned that if rigid this would be the case. Actually, when these flaps are closely packed, they are supported one by the other to cause an approximately radial extension of each flap. In some modifications of this device, the flaps are wide spaced and will not extend radially inward without the provision of positioning means, as is described more fully in connection with the drawings below. The device is adapted to be positioned over the end of the pin or other workpiece and then rotated at relatively high speed whereupon the surface of the workpiece is successively abraded or polished by each strip as it passes any given point on such surface.

DRAWINGS FIG. 1 is a perspective view of one formof the device of the present invention.

FIG. 2 is a schematic partial front view showing a modified version of the device of this invention.

Referring now to FIG. 1, a rotary hub or wheel 10 is provided having a drive means 11 extending from one end thereof. As illustrated, drivelmeans 11 engages with a rotary grinder 12 provided with operating handles 13 and connected to a suitable power source through cord 14. Extending from the surface of the hub 10 adjacent the drive means 11 is a rim portion 15. This is of suitable width for the operation to be performed and, obviously, can vary within quite wide limits as desired. Adhered to and spaced about the inner periphery 16 of rim 15 are strips or flaps 17 of an abrasive material. As shown, these flaps are quite closely packed and tend to support one another.

FIG. 2 shows a version of the present invention wherein only a few spaced abrasive flaps 20 are utilized. in this instance, flaps 20 are adhered to a pivotal arm 21 which extends through the rim 22 of the device and is pivoted around pins 23 mounted on such rim. e extension 24 of arm 21 carries at its outer end a counterweight 25. In operation, as the rim rotates as indicated by the arrow, counterweights 25 cause arms 21 to extend radially inward under the centrifugal force developed by such rotation and correspondingly cause the abrasive flaps 20 adhered to arms 21 to likewise extend radially inward from rim 22. r

The repetitive contact produces a unique abrading effect not achievable by rubbing tlie surface with abrasive and in many instances will produce a finish unattainable by other means. Any abrasive material may be used for the flaps so long as it is flexible in nature. Conventional flexible coated abrasives having acloth or paper backing may be used as well as lofty nonwoven synthetic fiber webs of the type illustrated in the patent to Camp et al., U.S. Pat. No. 3,020,139.

lclaim:

l. A rotary abrasive device having an annular rim adapted to be rotatably driven; a plurality of arm members pivotally mounted on and extending through said rim, a counterweight affixed to the end of each of said arms external said rim and at least one flexible abrasive flap affixed to the other end of each of said arms and extending inwardly of said rim. 

1. A rotary abrasive device having an annular rim adapted to be rotatably driven; a plurality of arm members pivotally mounted on and extending through said rim, a counterweight affixed to the end of each of said arms external said rim and at least one flexible abrasive flap affixed to the other end of each of said arms and extending inwardly of said rim. 